Josephine March doing excellent work in the comments and quoting Jacob Levy on Arendt and specifically expands one of my go-to quotations.
"Saying something obviously untrue, and making your subordinates repeat it with a straight face in their own voice, is a particularly startling display of power over them. It’s something that was endemic to totalitarianism. Arendt analyzed the huge lies and blatant reversals of language associated with the Holocaust. Havel documented the pervasive little lies, lies that everyone knew to be lies, of late Communism. And Orwell gave us the vivid “2+2=5.”
Being made to repeat an obvious lie makes it clear that you’re powerless; it also makes you complicit. You’re morally compromised. Your ability to stand on your own moral two feet and resist or denounce is lost. Part of this is a general tool for making people part of immoral groups. One child makes a second abuse a third. The second then can’t think he’s any better than the first, the bully, and can’t inform. In a gang or the Mafia, your first kill makes you trustworthy, because you’re now dependent on the group to keep your secrets, and can’t credibly claim to be superior to them"
Jacob Levy, Authoritarianism and Post-Truth Politics.